91553903 has 8 divisors (see below), whose sum is σ = 106768800. Its totient is φ = 78474480.

The previous prime is 91553887. The next prime is 91553911. The reversal of 91553903 is 30935519.

It is not a de Polignac number, because 91553903 - 2⁴ = 91553887 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91553983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 133118 + ... + 133803.

It is an arithmetic number, because the mean of its divisors is an integer number (13346100).

Almost surely, 2^91553903 is an apocalyptic number.

91553903 is a deficient number, since it is larger than the sum of its proper divisors (15214897).

91553903 is an equidigital number, since it uses as much as digits as its factorization.

91553903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266942 (or 266928 counting only the distinct ones).

The product of its (nonzero) digits is 18225, while the sum is 35.

The square root of 91553903 is about 9568.3803749642. The cubic root of 91553903 is about 450.7049083792.

The spelling of 91553903 in words is "ninety-one million, five hundred fifty-three thousand, nine hundred three".